diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_tanhf.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_tanhf.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sysdeps/ieee754/flt-32/s_tanhf.c b/sysdeps/ieee754/flt-32/s_tanhf.c index dc96da9a5b..5b48fb2e00 100644 --- a/sysdeps/ieee754/flt-32/s_tanhf.c +++ b/sysdeps/ieee754/flt-32/s_tanhf.c @@ -17,6 +17,7 @@ static char rcsid[] = "$NetBSD: s_tanhf.c,v 1.4 1995/05/10 20:48:24 jtc Exp $"; #endif +#include <float.h> #include <math.h> #include <math_private.h> @@ -41,7 +42,14 @@ float __tanhf(float x) if (ix == 0) return x; /* x == +-0 */ if (ix<0x24000000) /* |x|<2**-55 */ + { + if (fabsf (x) < FLT_MIN) + { + float force_underflow = x * x; + math_force_eval (force_underflow); + } return x*(one+x); /* tanh(small) = small */ + } if (ix>=0x3f800000) { /* |x|>=1 */ t = __expm1f(two*fabsf(x)); z = one - two/(t+two); |